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[" (a) "3],[" 12.For "x in R," the expre...

[" (a) "3],[" 12.For "x in R," the expression "(x^(2)+2x+c)/(x^(2)+4x+3c)" can take all real values if "c in:],[[" (a) "(1,2)," (b) "[0,1]],[" (c) "(0,1)," (d) "(-1,0)]]

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